Cases of word usage

1) a ring of coral reef(s) round a lagoon (atoll)

2) ring of leaves (called sepals) forming the outer support of the petals of an unopened flower-bud (calyx)

3) a line, rope, ring of officials etc used as a barrier (cordon)

4) an ornamental ring of gold, jewels etc worn on the head by a sovereign ruler (crown)

5) a circular band of wood or metal as put around a barrel etc; a large ring with paper stretched over it through which circus rides and animals jump (hoop)

6) one ring or loop of a chain (link)

7) a rubber ring etc to be thrown over a peg in a game (called 'quoits') (quoit)

8) of ring (rang)

9) a payment required for the use of a road, bridge, harbour etc; the costs suffered as a result of a war, disease, famine etc; (to cause a bell) to ring with slow, regular sounds (toll)

10) washing machine; dishwasher; a small flat ring of metal, plastic etc, used for making a joint or screw tight (washer)